Lamp



FIG. 1 is a perspective view of a lamp showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is another side elevational view thereof; and,

FIG. 5 is a top plan view thereof.

The broken lines shown on the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a lamp, as shown and described. 